Railway track circuit apparatus



July 28, 1931. H. s. YOUNG v RAILWAY TRACK CIRCUIT APPARATUS Filed June15, 1931 KATE INVENTOR.

H S 2 0 Uh 7 I 091 M ATTORNEY.

TED}STAT S I -Patented July-28, I

PATENT OFFICE HENRY s. O NG, or wrnxmsnnnq, P N YL ANIA, ASSIGNOR To THEUNION ,swrrcn & SIGNAL COMPANY, or SWISSVVALELPENNSYLVANIA, ACORPORATION OF PENNSYLVANIA I AILWAYTR-AGK crncnrr APPARATUS Applicationri a'iune 5,

My inventionirelates to railway track circuit apparatus,a'nd'particularly to track cir- 'cuit apparatus for allel tracks.

crossovers between par-s I will describeone form of apparatus embodyingmy invention, and will then point out the novel features thereof inthe'claim.

The accompanying drawing is a diagrammatic view showing one formof'fla'pparatus embodying my invention. I Referring to the drawing, thereference characters A and B designate two parallel.

' railway tracks. Track A is' provided with insulated j oints 2 to forma track section AT,

and track B is similarly provided'with insulated joints 2 to form, atrack-section BT. Section AT is providedwith a track circuit comprisinga battery 4A connected across the trails at one endof the section and atrack relay ATR connected across the rails at the other end of thesection. Track section ET is provided with a similar track circuit com II clalm 1s:

prising a track battery 4B and a track relay B rn;- i

' The sections AT and BT areconnected by a crossover G, comprlsing theusual switches SA and SB. The'rails of the crossover G aredivided byinsulated joints 3 to form two track sections GT1' and GT2. I Thesesections are provided with a track circuitcomprising a: source ofalternating current connected across the rails of section GT1, atrackrelay CTR having a winding 5 connected across the rails of sectionGT2, and a transformer 1T the primary f which is connected across I,therai-ls of section GTl' and the secondary 7 transformer T,thesecondary of which is I connected across the trackrails and the pri-'mary of which" isconnected with a source of alternating current "theterminals of which are designatedBX'and 'GX. The usual current-limitingimpedance R is interposed be-f tweenthe secondaryof transformer T andonea rail of 'the crossover. The track relay GTR, is of the two-windingtype, the second Winding 8 of whi'ch'is connected with the terminals BXand TGX o'f the same source 1931. Serial no; 544,486. I

cuit energy to thetransformer T.@ I

The insulated rail joints 3 at the junction of the two crossover tracksections eliminate allmetallic connection between the track circuits fortracks A and B, and the transformer 1T serves to transfer energy fromsection GT1 to section GT2 and at the same time maintains the insulationbetween track circuit AT and trackcircult BT.

Furthermore, all dead sections, due to the usual insulated oints at thefrogs, are el1minated by track circuit apparatus embodying my invention.

derstood that various changes and modifications may be madethereinwithin the scope of the appended claim without departing from the spiritand scope of my invention.

Having thus described my invention, what In combination, two parallelrailway trackseach provided with an insulated track section, a trackcircuit including a source of current and a track relay for each of saidsections, a crossover connecting said track sections and divided byinsulated joints to form two sections, and a track circuit for saidcrossover comprising a source of alter-' nating current connected withthe rails of one section and a track relay connected with the rails of.the other section as well as a transformer the primary of which isconnected with the rails of the first section and the secondary of whichis connected with the rails of the second section. I

Intestimony whereof I aifix my signature. HENRY S. YOUNG.

